<template>
  <div class="goodsinfo-container">
    <transition @before-enter="beforEnter" @enter="Enter" @after-enter="afterEnter">
      <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition>
    <!-- 商品轮播图区域 -->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
        </div>
      </div>
    </div>
    <!-- 商品购买区域 -->
    <div class="mui-card">
      <div class="mui-card-header">{{goodsinfo.title}}</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p class="price">
            市场价:
            <del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价:
            <span class="now_price">￥{{goodsinfo.sell_price}}</span>
          </p>
          <p>
            购买数量:
            <numbox @getCount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
          </p>
          <p>
            <mt-button type="danger">立即购买</mt-button>
            <mt-button type="primary" @click="addToShopCar">加入购物车</mt-button>
          </p>
        </div>
      </div>
    </div>
    <!-- 商品参数区域 -->
    <div class="mui-card">
      <div class="mui-card-header">商品参数</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p>商品货号:{{goodsinfo.goods_no}}</p>
          <p>库存情况:{{goodsinfo.stock_quantity}}件</p>
          <p>上架时间:{{goodsinfo.add_time | dateFormat}}</p>
        </div>
      </div>
      <div class="mui-card-footer">
        <mt-button type="primary" size="large" @click="goDesc(id)">图文介绍</mt-button>
        <mt-button type="danger" size="large" @click="goComment(id)">商品评论</mt-button>
      </div>
    </div>
  </div>
</template>

<script>
import swiper from "../subcomponent/swiper.vue";
import numbox from "../subcomponent/goodsinfo_numbox.vue";
export default {
  data() {
    return {
      id: this.$route.params.id, //将路由参数中的id挂载到data上方便后期调用
      lunbotu: [], //轮播图信息
      goodsinfo: {}, //获取到的商品信息
      ballFlag: false, //控制小球隐藏和显示的标识符
      selectedCount: 1 //保存用户选中的商品数量,默认1
    };
  },
  created() {
    this.getLunbotu();
    this.getGoodsinfo();
  },
  methods: {
    getLunbotu() {
      this.$http.get("api/getthumimages/" + this.id).then(result => {
        if (result.body.status == 0) {
          result.body.message.forEach(item => {
            item.img = item.src; // 因为swiper中写死了轮播图的path = item.img,
            // 但是result的返回值是src所以循环result再添加一个img属性
          });
          this.lunbotu = result.body.message;
        }
      });
    },
    getGoodsinfo() {
      this.$http.get("api/goods/getinfo/" + this.id).then(result => {
        if (result.body.status == 0) {
          this.goodsinfo = result.body.message[0];
        }
      });
    },
    goDesc(id) {
      this.$router.push("/home/goodsdesc/" + this.id);
    },
    goComment(id) {
      this.$router.push("/home/goodscomment/" + this.id);
    },
    addToShopCar() {
      //添加到购物车
      this.ballFlag = !this.ballFlag;
      //自定义一个商品信息对象
      var goodsinfo = {
        id: this.id,
        count: this.selectedCount,
        price: this.goodsinfo.sell_price,
        selected: true
      };
      this.$store.commit("addToCar", goodsinfo);
    },
    beforEnter(el) {
      el.style.transform = "translate(0,0)";
    },
    Enter(el, done) {
      el.offsetWidth;
      //获取小球在页面中的位置
      const ballPosition = this.$refs.ball.getBoundingClientRect();
      //获取徽标在页面中的位置
      const bagdePosition = document
        .getElementById("badge")
        .getBoundingClientRect();
      //
      const xDist = bagdePosition.left - ballPosition.left;
      const yDist = bagdePosition.top - ballPosition.top;
      //
      el.style.transform = `translate(${xDist}px, ${yDist}px)`;
      el.style.transition = "all .4s linear";
      done();
    },
    afterEnter(el) {
      this.ballFlag = !this.ballFlag;
    },
    getSelectedCount(count) {
      //当子组件把选中的数量传递给父组件的时候,把选中的值保存到data上
      this.selectedCount = count;
      console.log(this.selectedCount);
    }
  },
  components: {
    swiper,
    numbox
  }
};
</script>

<style lang="scss" scoped>
.goodsinfo-container {
  background: #eee;
  overflow: hidden;
  .now_price {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }
  .mui-card-footer {
    display: block;
    button {
      margin: 10px 0;
    }
  }
  .mui-card-header {
    min-height: 62px;
  }
}
.ball {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: red;
  position: absolute;
  z-index: 11;
  top: 428px;
  left: 78px;
}
</style>